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Collision-induced absorption in the rototranslational band of dense hydrogen gas
University of Texas, Physics Department.ORCID iD: 0000-0002-7629-0169
University of Texas, Physics Department.
Labaratoire de Photophysique Moléculaire, CNRS, Campus d’Orsay, France.
Labaratoire de Photophysique Moléculaire, CNRS, Campus d’Orsay, France.
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2003 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 119, no 23, p. 12264-12270Article in journal (Refereed) Published
Abstract [en]

Measurements of the H2–H2 collision-induced absorption spectra at temperatures of 297.5 and 77.5 K are reported in the frequency range from 1900 to 2260 cm−1 at gas densities ranging from 51 to 610 amagat. Ab initio calculations of the absorption are carried out for comparison with the measurements. In these calculations, for the lower temperature close-coupled equations describe the H2–H2scattering in the presence of a weak electromagnetic radiation field; the anisotropy of the H2–H2interaction is accounted for. For the room temperature calculations, the isotropic potential approximation is employed. Agreement of measured and calculated spectral shapes is observed. However, in the far wing, at large frequencies (≳2000 cm−1), discrepancies of measured and calculated spectral intensities are observed which are somewhat larger than the combined, estimated uncertainties of theory and measurement. These differences remain unexplained at this stage.

Place, publisher, year, edition, pages
2003. Vol. 119, no 23, p. 12264-12270
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Other Physics Topics
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Tillämpad fysik
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URN: urn:nbn:se:ltu:diva-9190DOI: 10.1063/1.1625635Local ID: 7c057e76-cc7a-40f7-90e3-d187b4bfb118OAI: oai:DiVA.org:ltu-9190DiVA, id: diva2:982128
Note
Upprättat; 2003; 20141020 (maggus)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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